Lift.



PATENTED AUG. 25, 1903.

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APPLICATION FILED AUG. 11, 1902.

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No. 737,316. PATENTED AUG. 25, 1903.

H. D. BARLOW.

LIFT.

APPLICATION FILED AUG.11. 1902.

UNITED STATES Patented August 25, 1903.

PAT NT X OFFICE."

LIFT.

SPECIFICATION forming part of Letters Patent No. 737,316, dated."August25, 1903.

Application filed August 1]., 1902. Serial No. 119,237. (No model.)

To allwhomit may concern: 7

Be it known that I, HERBERT DUDLEY BAR- LOW, a subject of the King ofGreat Britain and Ireland, and a resident of 237 Shaftesbury avenue,London, W. (3., England, have invented certain new and usefulImprovements in and Relating to Lifts and the Like, (for which I havemade application for Letters Patent in Great Britain, No. 1,352, datedJanuary 17, 1902,) of which the following is a specification.

My invention relates to lifts or hoists, and especially to those whichwork between two levels only or to hauling appliances which work betweendefinite starting and stopping points and are drivenby gearing from anengine, electric motor, or other source of power.- In such lifts orhauling appliances the greatest power has tobe exerted in starting upwith the load on, and this isvery severeon the driving engine or motor.or on the belt gear if the operation of the lift or hauling applianceis effected by means of belts and fast and loose pulleys. Again,difficulties arise in the operation of such lifts and hauling appliancesin preventing overrunning at both ends and in insuring steady startingfrom rest and stopping.

My invention has for its object to remove these difficulties and tosecure the operation of lifts and hauling appliances of this characterin an improved manner, so that the minimum power may be taken from thesource at the beginning of the movement, overrunning prevented, and slowstarting and stopping secured.

My invention consists, broadly, in applying to a lift or haulingappliance a. crank driven by a motor through any suitable gearing tooperate a multiplying-gear, either directly or through a connecting-rod,in such a way that each complete traverse of the latter, and thereforeof the lift or the wagon propel-led, is effected with a simple harmonicmotion, which produces slow starting and stopping independently of therate at which. the motor or driving shaft is running.

My invention consists, more specifically, in transmitting power from themotor shaft through a reducing-gear to a slow-running shaft, on which ismounted a powerful crank, from the pin of which is operated the movablerection.

multiplied to give a complete movement of the lift or wagon from one endof its traverse to the other and back again in each revolution. Half arevolution of the crank thus corresponds to a complete movement in onedi- The motor or shaft operating the lift-cage or wagon does not requireto be re- 1 versed in direction to effect the opposite motions of thelift, and starting and stopping may be effected by simply starting andstopping'or connecting and disconnecting the motor. .It will thus beseen that the motion being practically simple harmonic, a slow startingand;stopping of the lift-cage or of;

having a comparatively small starting torque v to be employed whetheradapted for direct or alternating currents and enables reversingswitchesto be dispensed with.

Referring to the accompanying drawings, Figures 1 and 2 show aside andend elevation, respectively, of one form of my invention as applied to alift. Fig. 3 is a view,on a smaller scale,showing thegeneralarrangementof such an application, while Fig. 4 is a scrap view showingmeans for altering and adjusting the travel of the lift-cage;

' In carrying my invention into effect according to one modification asapplied to a lift working between two floors a b I provide an ordinaryshunt-wound motor 0, mounted diroot on a shaft carryinga worm d, gearingwith a worm-wheel e, mounted on a second motion-shaft, which carriesalso the small pinion f of a second reducing-gear, the large wheel h ofwhich is mountedon a third shaft carried on suitable standards 2' i.This large spur-wheel is overhung and is strongly constructed to act asa disk-crank. A crank-pin k is secured to the side of the wheel and, asshown in Fig. 4, is preferably adjustable in a radial direction by meansof a screw 1, adapted to traverse a nut forming part of the crank-pinalong a radial slot m or .byaany equivalent device, so that the travelof theerably supported on the same sole-plate a or on rigid attachmentsthereto, such as the brackets 0 0, I mount the two blocks 7' s of amultiple-sheave multiplyinggear, the block '1' remote from the crankbeing pivotally connected to the sole-plate or its attachments, Whilethe axle of the traversing block 5 is linked up by a connecting-rod t tothe pin of the disk-crank. The carrying-rope u of the lift-cage passesover the sheaves of the blocks and finally over the carrying-pulley t atthe top of the lift-well and is secured to the beam of the cage 10. Isometimes prefer to mount the block 3 of the multiplying-gear direct onthe crank-pin and omit the connecting-rod t.

The essential feature of a lift constructed in accordance with myinvention is that it starts and stops relatively slowly in harmonic timeirrespective of the speed of the motor or other driving shaft. It willbe obvious that the only gear required to control this lift is anordinary motor-switch, which may be operated, if desired, from the cageand that reversal of the motor is not necessary. Further, it will beobserved that the exact point of starting and stopping the motor at theextreme limits of the travel of the lift is not of very greatimportance, as at these points a considerable number of revolutions ofthe motor is required to produce a small movement of the cage orplatform.

My invention enables a single belt and a fast and loose pulley to beemployed or an electric motor havinga small starting torque, and itgreatly simplifies the controlling-gear.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is

1. A hoisting-gear comprising, a crank, means for operating said crank,multiple blocks; and a rope wound around the sheaves of the blocks andconnected to the car to be operated; one of the blocks being mounted ona stationary part of the apparatus and the other connected to thecrank-pin.

2. A hoisting-gear comprising, a crank, means for operating the crank,multiple blocks, a rope wound around the sheaves of the blocks andconnected to the car to be operated; one of the blocks being mounted ona stationary part of the apparatus, and a link connecting the otherblock with the said crank.

3. A hoisting-gear comprising, a crank, a motor,reducing-gearingconnecting the crank to the motor, multiple blocks, a guideway in whichone of the blocks is mounted to travel; the other block being mounted ona stationary part of the apparatus, a rope Wound around the sheaves inthe blocks and connected to the car to be operated, and a linkconnecting the crank with the traveling block.

In Witness whereof I have hereunto set my hand in presence of twoWitnesses.

HERBERT DUDLEY BARLOW.

Witnesses:

MATTHEW ATKINSON ADAM, GEORGE ISAAC BRIDGES.

